CVE-2026-8666

CRITICALNVD 9.87.7▼
EchelonGraph scoreMEDIUM confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. NVD baseline CVSS 9.8; sources differ by 2.1.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, max_ttl, count, or time_out request parameters due to insufficient input validation when constructing shell commands.

CVSS v3
9.8
EG Score
7.7(medium)
EPSS
47.7%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 29, 2026
No patch confirmed yet.
generic

Rapid7 Extensions

https://extensions.rapid7.com/extension/traceroute

Vendor Advisories for CVE-2026-8666(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 62× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 00:09 UTCEG score recompute
  2. 2026-07-07 00:09 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 11:18 UTCEG score recompute
  6. 2026-07-06 11:18 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 21:43 UTCEG score recompute
  10. 2026-07-05 21:43 UTCGHSA enrichment
  11. 2026-07-05 08:51 UTCEG score recompute
  12. 2026-07-05 08:51 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 19:59 UTCEG score recompute
  16. 2026-07-04 19:59 UTCGHSA enrichment
  17. 2026-07-04 07:08 UTCEG score recompute
  18. 2026-07-04 07:08 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-03 17:57 UTCEG score recompute
  22. 2026-07-03 17:56 UTCGHSA enrichment
  23. 2026-07-03 05:01 UTCEG score recompute
  24. 2026-07-03 05:01 UTCGHSA enrichment
  25. 2026-07-02 16:08 UTCEG score recompute
Show 37 more
  1. 2026-07-02 16:08 UTCGHSA enrichment
  2. 2026-07-02 03:16 UTCEG score recompute
  3. 2026-07-02 03:16 UTCGHSA enrichment
  4. 2026-07-01 15:07 UTCEPSS rescore
  5. 2026-07-01 14:25 UTCEG score recompute
  6. 2026-07-01 14:25 UTCGHSA enrichment
  7. 2026-07-01 01:34 UTCEG score recompute
  8. 2026-07-01 01:34 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 12:43 UTCEG score recompute
  11. 2026-06-30 12:43 UTCGHSA enrichment
  12. 2026-06-29 23:52 UTCEG score recompute
  13. 2026-06-29 23:51 UTCGHSA enrichment
  14. 2026-06-29 19:26 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-29 10:59 UTCEG score recompute
  17. 2026-06-29 10:59 UTCGHSA enrichment
  18. 2026-06-28 22:08 UTCEG score recompute
  19. 2026-06-28 22:08 UTCGHSA enrichment
  20. 2026-06-28 14:07 UTCEPSS rescore
  21. 2026-06-28 09:16 UTCEG score recompute
  22. 2026-06-28 09:16 UTCGHSA enrichment
  23. 2026-06-28 04:56 UTCEPSS rescore
  24. 2026-06-27 20:25 UTCEG score recompute
  25. 2026-06-27 20:25 UTCGHSA enrichment
  26. 2026-06-27 07:34 UTCEG score recompute
  27. 2026-06-27 07:34 UTCGHSA enrichment
  28. 2026-06-27 03:08 UTCEPSS rescore
  29. 2026-06-26 18:43 UTCEG score recompute
  30. 2026-06-26 18:43 UTCGHSA enrichment
  31. 2026-06-26 05:44 UTCEG score recompute
  32. 2026-06-26 05:44 UTCGHSA enrichment
  33. 2026-06-25 16:53 UTCEG score recompute
  34. 2026-06-25 16:53 UTCGHSA enrichment
  35. 2026-06-25 13:50 UTCEPSS rescore
  36. 2026-06-25 04:01 UTCEG score recompute
  37. 2026-06-25 04:01 UTCGHSA enrichment

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8666?
CVE-2026-8666 is a critical vulnerability published on June 25, 2026. OS Command Injection vulnerability in the traceroute action of Rapid7 InsightConnect Traceroute Plugin on Linux allows remote attackers to execute arbitrary OS commands via the host, port, maxttl, count, or timeout request parameters due to insufficient input validation when constructing shell…
When was CVE-2026-8666 disclosed?
CVE-2026-8666 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8666 actively exploited?
CVE-2026-8666 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8666?
CVE-2026-8666 has a CVSS v3 base score of 9.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.7.
How do I remediate CVE-2026-8666?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8666, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-8666

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